Work-rest for grinding-machines.



No. 697,852. Pat'ented Apr. l5, I902.

A. B. LAND'IS. 7 WORK REST FOR GRINDING MACHINES.

(Application filed Sept. 7, 1901.)

(No Model.)

THE cams PETERS co, Puorom-ua. WASHINGYON, u. c,

Human STATES ATE T FFTCE.

ABRAHAM B. LANDIS, OF \VAYNESBORO, PENNSYLVANIA.

VVORK-REST FOR GRINDINGMMACHINES.

SPEGIFEQATIGN forming part of Letters Patent No. 697,852, dated. April15, 1902. Application filed September '7, 1901. Serial No. 74,619. (Nomodel.)

To all whmn it may concern:

Be it known that I, ABRAHAM B. LANDIS, a citizen of the United States,residing at lVaynesboro, in the county of Franklin and tate ofPennsylvania, have invented certain new and useful Improvements inWork-Rests for Grinding-Machines, of which the following is aspecification.

My said invention consists in an improved construction of work-rests forgrinding-machines of that general character shown in various patentsheretofore granted to me, whereby the work may be held to thegrinding-wheel under a yielding pressure adjusted to suit the Work beingdone or against a fixed rest, as desired, as will be hereinafter morefully described and claimed.

Referring to the accompanying drawings, which are made a part hereof andon which similar reference characters indicate similar parts, Figure 1is a top or plan view of a work-rest of myimproved construction; Fig. 2,a side elevation, the frame being partly broken away to show the partsmore clearly; and Fig. 3, a similar view to Fig. 2, illustratingmodifications in the construction.

In said drawings the portions marked A represent the bed of the machine,B-the frame of the rest, and C the pivoted bar carrying the rest proper.

The machine-bed A, on which the rest is mounted, may be the bed of anymachine of the character mentioned or with which such a rest may beused.

The frame B is of appropriate form to support the parts and is mountedon the bed in any approved manner. It is hollow, and its upper portionhas parallel sides united at the rear and open at the end adjacent tothe work.

The bar 0 is of any appropriate form, that shown being preferred,consisting of a substantially central portion of considerablecross-sectional area and reduced in size each side thereof, the frontend being formed to support the rest-b1ock O and the rear portion tosupport a weight 0 mounted to slide thereon. Its central portion isbored out transversely and has a cylindrical plug (J therein, which plugis formed with a slot extending diagonally from the top near the reartoward the bottom and front, its parallelsides forming oblique surfaces.In said slot, just fitting between said parallel surfaces, is mounted aroller 0 formed with flanges c on its ends, which engage theouter endsof said plug and hold the two parts in fixed relation longitudinally.Said roller is inserted through the open lower side of the slot, whichis then closed by a fillet 0 before the plug is put in place.Cone-shaped depressions are formed in the ends of said roller, in whichcone-pointed bearings 0 adjustably mounted in the sides of the frame,engage. A sleeve 0 is mounted in a screw-threaded perforation in plug Cthe lower end extending into the oblique slot, and the outer endprojecting through a segmental slot in bar (J. Said sleeve is interiorlyscrew-threaded, and a setscrew 0 is mounted therein, the end of which isadapted to project through to bear against the surface of roller O whendesired, as will be presently described. A set-screw 0 projects througha screw-threaded perforation in bar 0 to impinge against the surface ofplug (J and lock these parts in the desired relative positions,- whichcan be secured by turn ing said plug through the medium of sleeve 0 Theobject of turning or adjusting this plug is to vary the obliquity of theslot or surface moving on said pivot-roller for the purpose of changingthe forward pressure of the rest without changing the upward pressure,which is done by sliding the weight on the bar. The forward end of bar 0is pref erably formed with a plane face, with a flange having a taperedrear face i at the top. A sepa rate block 0, forming the rest-face, ispreferably mounted (for convenience of chang ing sizes) on this end bymeans of a hook it, which is adapted to hook over said flange. On thetop of said block 0 is mounted a spring clip or finger 0, consisting ofa short flat bar, the point of which is adapted to rest on the top ofthe work and the rear portion of which rests in a notch in said block. Abolt 0 extends through the perforation in the frontend of bar 0,projecting below said bar, and has a coiled spring 0 thereon, interposedbetween said bar and a thumb-nut c on the screw-threaded lower end ofsaid bolt. By this means the force with which said finger is held to thework may be regulated, as will be readily seen, while said finger may belifted out of the notch in block 0 and swung out of the way when it isdesired to take out or put in the work, as indicated by dotted lines inFig. 1. The rear end of said bar 0 is of suitable form to support theweight G which is mounted to slide thereon. A setscrew 0 in said weightis adapted to impinge against the bar and hold said weight in anyadjusted position. A set-screw b in frame B under the weight is adapted.to limit its downward movement. Another set-screw b in the frameadjacent to the work is adapted to clamp said weight rigidly between itspoint and a rib b on the inner face of the frame opposite when desired.

The operation is as follows: It being desired to support the work undera yielding pressure, the point of rest is adjusted against the work, theset-screws and I) being adjusted so that they will not bear against theroller (3 and weight 0 respectively. The weight is thus supportedagainst said work, and the degree of pressure may be regulated asdesired by adjusting it on the bar 0 to shorten or lengthen the leveragebehind the pivot-points c". It will be seen that the rest is thus forcedagainst the work not only in an upward direction by reason of its motionon pivots 0 but also in a horizontal or longitudinal direction by reasonof its motion on the oblique surfaces of the slot in'plug C slidingdownward over roller C and the pressure in the horizontal direction isvaried by the change of angle of the oblique slot without changing theweight, as above described.

Thus as the work is ground away the rest will feed itself up to it tomaintain a uniform I pressure at all times and will readily yield toirregularities, adjusting itself to all conditions. When the point ofscrew 0 is brought to restagainst the roller C the forward motion willbe stopped, and when the weight C reaches the point of screw b theupward'mo- I tion will. be stopped, which with proper adj'ustment occurswhen the work has been ground to the desired size. wears it can beadjusted to allow therefor by the screws 1) and 0 By the use of theclamping screw b the weight maybe clamped at any, period of the work andthe rest made rigid if for any reason'desired. The finger C", as beforestated, may be swung to one side out of the Way whenever work is to beremoved from or placed in the machine or adjusted and serves to steadythe work against vibration in a direction away from the rest and towardthe wheel or to prevent chat tering, as it is termed.

Fig. 3 shows a modification, in which the bar 1 carrying the rest withits rear end provided with a series of notches, and a spring 2substituted for the weight,'one end of said spring engaging with one ofsaid notches, and the other end connected to a screw-threaded pin whichextends through an aperture in a part of the frame and has athumb-screw3 on its opposite end, by which it may be secured and the tension of thespring adjusted, as

As the bearing I well as by shifting the opposite end of said springfrom one notch to another on the top of bar 1. A set-screw 4 is providedunder the end of said bar for limiting its motion; otherwise theconstruction is the same as shown in the principal views and abovedescribed. The operation of the weight, however, is more satisfactory,as owing to its mass vibrations and chattering are impossible in its useas they occur in the use of the spring. These and other modifications inthe details of construction may of course be made without departing frommy invention as hereinafter pointed out in the claims.

Having thus fully described my invention, What I claim as new, anddesire to secure b Letters Patent, is

1. In a work-rest for grinding-machines, the combination of a base orsupport, a bar pivoted between its ends at one side of the work providedwith a work-engaging bearing on one end thereof and an adjustable weightat its other end.

2. In a Work-rest for grinding-machines, the combination of a base orsupport, a bar pivoted between its ends at one side of the work providedwith a work-engaging bearing at one endthereof, and an adjustable stopcontrolling the elevation of said bearing.

3. In a work-rest for grinding-machines,

the combination of a base or support, a bar with a Work-engaging bearingat one end thereof, said bar pivoted on said base, an adjustable stopcontrolling the elevation of said bearing and an adjustable weight onthe opposite side of the pivot in said bar from said work-engagingbearing.

. 4:. In a work-rest for grinding-machines, the combination of a base orsupport, and a pivoted bar with a work-engaging bearing at one endthereof, the pivot of saidbar engaging an oblique surface.

5. In a work-rest for grinding-machines, the combination of a bar havinga Work-engaging bearing at one end thereof, an adjustable weight on theother end, and a central pivot engaging an adjustable oblique surface.

6. In a work-rest for grinding-machines, the combination of a bar havinga work-engaging bearing, an adjustable weight, a pivot engaging anoblique surface, and an adjustable stop engaging said pivot.

7. In a work-rest for grinding-machines ICO gaging bearing, a pivot insaid bar, said pivot I engaging an oblique surface, and a clip to engagethe work.

10. In a work-rest for grinding-machines the combination of a pivotedbar, and a workengaging bearing mounted on the end thereof, said bearinghaving a hook by which it is supported to said bar.

11. In awork-rest for grinding-machines, a bar having a work-engagingbearing at one end, a pivot approximately at its center, an adjustableweight on the other end and means for clamping said bar rigidly whenrequired. 12. In a work-rest for grinding-machines a base or supporthaving a bar pivoted thereto, said bar having a work engaging bearing,said pivot engaging an oblique surface, an adjustable stop engaging saidpivot, an adj ustable weight on said bar and a stop to control theupward position of said work-engaging bearing.

13. In a work-rest for grinding-machines, a base or support, having abar. pivoted thereto, said bar having a work-engaging bearing, the pivotof said bar engaging an oblique surface, an adjustable stop engagingsaid pivot, an adjustable weight on said bar, a stop to control theupward motion of said work-engaging bearing, and a clip to engage thetop of the work.

14. In a work-rest for grinding-machines, a base or support, having abar pivoted thereto, said bar having a work-engaging bearing, said pivotengaging anoblique' surface, an adjustable weight on said bar, anadjustable stop engaging said pivot, a stop to control the upward motionof said work-engaging hearing and means for locking said bar in a rigidposition when required.

15. In a work-rest for grinding-machines, a base or support formed likean open box having sides to which a bar is pivoted, said bar having awork-engaging bearing on one end, a weight on the other end of said bar,said parts being contained in said box which thus forms a protection tosaid bar so that its free action cannot be interfered with.

16. In a work-rest for grinding-machines, a base or support, a barpivoted thereto, said bar having a work-engaging bearing, said pivotengaging an adjustable oblique surface,

an adjustable weight on said bar, an adj ust able stop engaging saidpivot, an adjustable stop to control the upward motion of saidwork-engaging bearing, a clip to engage the top of the work and meansfor locking said bar in a rigid position when required.

17. In awork-rest for grinding-machines, a pivoted bar, a work-engagingbearing on one end thereof, a roller on said pivot engaging an obliquesurface, and means for holding the bearing yieldingly tothe workattached to the other end of said bar.

18. In a work-rest for grinding-machines, the combination of a base orsupport, a pivotedbar with a work-engagin g hearing at one end thereof,the pivot engaging an oblique surface and an adjustable weight at theother end of said bar.

19. In a work-rest for grinding-machines the combination of a base orsupport,=a pivoted bar with a work-engaging bearing at one end thereof,the pivot engaging an adjustable oblique surface, and means for holdingsaid bearing yieldingly in engagement with the Work.

20. In a work-rest for grinding-machines, the combination of a base orsupport, a bar with a work-engaging bearing, said bar pivotedon anoblique surface, a stop controlling the upward motion of said bearing,and means for holding said bar yieldingly in engagement with the work.

21. In a work-rest for grinding-machines, the combination of a base orsupport, a bar with .a work-engaging bearing, said bar being pivoted 011an adjustable oblique surface, a stop controlling the upwardmotion ofsaid bearing, and means for holding said bearing yieldingly inengagement with the work.

22. In a work-rest for grinding-machines, the combination of a base orsupport, a bar with a work-engaging bearing, said bar pivoted on anoblique surface, an adjustable stop engaging said pivot controlling theforward position of said bearing and means for holding saidbearingyieldingly in engagement with the work.

23. In a work-rest for grinding-machines,

the combination of abar with awork-engaging bearing, said barbeingpivoted on an ad-' j ustable oblique surface and adjustable stopsengaging said pivot controlling the forward positionof saidbar, a stopcontrolling the upward position of said bearing, means for holding saidbearing yieldingly in engagement with the work and a clip to engage thetop of said Work.

24. 'In a work-rest for grinding-machines,

a pivot-bar with a work-engaging bearing, a

clip engaging the top of the work and a spring for holding said clipyieldingly tosaid work.

25. In a work-rest for grinding-machines, a work-engaging bearing, meansfor holding said bearing to the work, a clip engaging the top of thework, and aspring holding said clip yieldingly to said work.

26. In a work-rest for grinding-machines, a work-engaging bearingarranged with ahook as shown to attach to the end of a bar with meansfor holding said bearingyiel'dinglyin contact with the work, a clipforengaging the top of the work and also the top of the bearing by whichsaid bearing is held'in position.

27. Awork-restforgrinding-machinesc0111- prising a bar having awork-engaging bearing, said bar havinga slotted p1ug,'said slot formingan oblique surface which engages with the pivot in the support. 7

2S. Awork-rest for grinding-machines com prising a bar having awork-engaging'bearing, said'bar having a slotted plug, said slot formingan oblique surface which engages with the pivot in the support, saidplug having apin by which it is turned to adjust the obliquity asdesired, a screw for locking said plug and a screw-stop engaging thepivot passing through the pin.

29. AWork-rest for grinding-machines comprising a bar having awork-engaging hearing, said bar having a slotted plug, said slot formingan oblique surface which engages with a pivot formed with a roller, saidroller having flanges at each end tohold the bar against side movement.

30. A work-rest for grinding-machines comprising a bar having awork-engaging hearing, said bar having a slotted plug, said slot formingan oblique surface, said surface bearing upon a pivot, said plug beingadjustable in a rotary direction whereby the forward tension of thebearing against the work is adjusted, and an adjustable weight wherebythe upward tension is adjusted.

31. A work-rest for grindingmachines, comprising a bar having awork-engaging bearing, said bar having a slotted plug, said slot formingan oblique surface, said surface bearing upon a pivot, said plug beingadj ustable in a rotary direction whereby the forward tension of thebearing against the work is adjusted, and stops for limiting themovement of said bar.

32. A work-rest for grindingmachines, comprising a bar having awork-engaging bearing, said bar having a slotted plug forming an obliquesurface, said surface bearing upon a pivot, said plug being adjustablein a rotary direction, whereby the forward tension of the bearingagainst the work is adjusted,

means by which the upward tension on the work is produced, stops forlimiting the movement of said bar and a clamping-screw by which said baris rigidly locked.

33. A work-rest for grinding-machines, comprising a bar pivoted andmounted to slide on an oblique surface which is adjustable as to pitch,substantially as set forth.

34:. A Work-rest for grinding-machines co mprising a bar pivoted andmounted to slide on an oblique surface under an adjustable pressure,substantially as set forth.

35. Awork-restforgrinding-machinescom prising a support provided withthe Work-engaging bearing mounted to both pivot and slide toward thework under adjustable pressure, substantially as set forth.

36. In a work-rest for grinding-machines, the combination of the frame,the pivoted bar mounted therein, means forautomatically adjusting saidbar toward the work, the workengaging bearing on said bar, andcontrolling-stops, substantially as set forth.

37. In a Work-rest for grinding-machines, the combination with thework-engaging bearing, of a yieldingly-mounted clip or finger arrangedto engage the upper side of the work lightly, substantially as setforth.

In witness whereof I have hereunto set my hand and seal, at\Vaynesboro,Pennsylvania, this 26th day of August, A. D. 1901.

' V ABRAHAM B. LANDIS. [L. s.:|

Witnesses:

RUssELL MoWEN, ALF. N. RUSSELL.

